Re-add upload texture (#2915)

* vello: code cleanup of resource overwrites

* upload_texture: upload cpu textures as SRGBA8

* vello: fix wgpu::Texture leak within vello's `context.resource_overrides` HashMap

* fix missing feature gate

node-graph/wgpu-executor/Cargo.toml

@@ -25,3 +25,4 @@ futures = { workspace = true }
 web-sys = { workspace = true }
 winit = { workspace = true }
 vello = { workspace = true }
+bytemuck = { workspace = true }